Mutual Effect of Steelmaking Slag Layer Depth and Diameter on Alkali Elution Rate in Open Channel Vessels with Straightened Seawater Flow

Go Takeuchi, Hironori Tamaki, Md Azhar Uddin, Yoshiei Kato, Eiji Kiso, Katsunori Takahashi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The mutual effect of steelmaking slag layer depth and diameter on alkali elution rate was investigated using two kinds of open channel vessels with straightened seawater. Seawater velocity, slag layer depth, and diameter were changed from 0.2 × 10−2 to 4.2 × 10−2 m/s, from 3.3 × 10−2 to 5.0 × 10−1 m, and from 0.10 × 10−2 to 2.18 × 10−2 m, respectively. The alkali elution rate increased with an increase in seawater velocity. The effective mass transfer coefficient, which was smaller than the true mass transfer coefficient, was calculated using the total slag surface area including the slag layer irrelevant to the alkali elution. It approached the true mass transfer coefficient when the slag diameter was larger and the slag layer was thinner. Moreover, the ratio of the effective mass transfer coefficient to the true one approached unity when the pH change in the slag layer was decreased. The slag layer height, H (m), involved in the alkali elution rate was calculated using H/d = 2.98 × 10−2Re − 1.24 × 10−5Re2 when the total slag layer height, hs (m), was larger than H (m). Here, d is the slag diameter (m) and Re is the Reynolds number.

Original languageEnglish
Pages (from-to)459-468
Number of pages10
JournalJournal of Sustainable Metallurgy
Volume3
Issue number3
DOIs
Publication statusPublished - Sep 1 2017

Keywords

  • Alkali elution
  • Open channel
  • Seawater
  • Steelmaking slag

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Mechanics of Materials
  • Metals and Alloys

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